original descriptionOken, L. (1815-1816). <em>Lehrbuch der Naturgeschichte. Dritter Theil: Zoologie. Erste Abtheilung: Fleischlose Thiere.</em> Leipzig: C.H. Reclam & Jena: A. Schmid. xxviii + 842 pp. + xviii, 40 pls., available online athttp://books.google.com/books?id=Spo5AAAAcAAJ[details]